Diesel Generator Electric
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On a large generator powered by a 6cyl. john dear diesel What would make the exciter rotor banding come loose?
I recently seperated the generator from the engine and replaced the rear main oil seal on the engine the electric generator was only moved back about 16-18 inches to access rear main seal. job went well with no problems after completeing job I turned down rpms to about 1000 rpm It was put back in service They use it to power up refer containers from the harbor. the next day I check it and they had turned up rpms to ??? as fast as it would run and 12 refer units running off it oh it's 480 volt well it ran for a week non stop and broke down and of corse it was my fault all i did was unbolt drive plate on front of rotor from flywheel of engine ..est to repair is 6,000 could this be my fault after it ran for a week or caused from hi rpms and heat related possibley
A little more information would be helpful as to the size and model of generator. Is it possible the repair shop could give you more detailed explanation as to exactly what they believe happened?
Is this a single bearing or two bearing generator? If it has only one bearing and the shaft is supported by the engine flywheel on the engine end, then the postion and shimming of the engine and generator may be critical to keep the rotor centered between the stator poles. These clearances are very small and they could have been rubbing if not aligned. On small single bearing types, the housings are made to fit together in perfect alignment, and can not be misaligned to avoid this problem. On larger units, this matched housing arrangement may not be possible.
A generator with a bearing at each end of it's shaft is less likely to have this problem of rotor alingment, It would have a problem with coupling or bearing failures if not properly aligned with the engine. This link may help explain. http://www.cumminsgeneratortechnologies.com/www/en/common/pdfs/manuals/bc/TD_BC%20MAN%20GB_01_10_Rev04.pdf
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October 15th, 2005 in
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